--  @testpoint:opengauss关键字cascaded(非保留)，作为函数名
--关键字不带引号-成功
drop function if exists cascaded;
create function cascaded(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--清理环境
drop function cascaded;

--关键字带双引号-成功
drop function if exists "cascaded";
create function "cascaded"(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--清理环境
drop function "cascaded";

--关键字带单引号-合理报错
drop function if exists 'cascaded';
create function 'cascaded'(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/

--关键字带反引号-合理报错
drop function if exists `cascaded`;
create function `cascaded`(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/